Metal-bending machine.



1. M. FEDDERS. METAL BENDING MACHINE. APPLICATION FILED MAY zz msl 1 #278,897. I 4 Patented Sept. 17, 1918.

I 6 SHEETSSHEE T l.

ATTORNEYS.

INVENTUR J. M. FEDD ERS. v METAL BENDiNG-MACHINE.

APPLICATION FILED MAY 22. 1916- 1,278,897. PatentedSept; 17,1918.

6 SHEETS-SHEET 2.

1 Fig. E

lNvENTuR ATTDRNEYE.

J. FEDDERS. METAL BENDING vMACHINI'L. APPLICATION FILED MAY 22. I916.

PatenteflSept.17,l918.'

6 SHEETS-SHEET 3.-

INV-ENTEIR hYb fmm ATTORNEYS.

l. M. FEDDERS.

METAL BENDING MACHINE. APPLICATION FILED'MAY 22. 1916.

1,278,897. Patented Sept. 17, 1918.

6 SHEETS-SHEET 4.

INVENTEIR ATTURNEYE.

DRRIS pcrzns cm. Fnnm-Lmm. WASHINGTON, n. c.

l. M. FEDDERS.

METAL BENDING MACHINE. APPLICATION FILED MAY 22. 1916.

INVENTDR ATTORNEYS.

5 PETERS 00.. Puomuma" wAsumc J. M. FEDDERS.

METAL BENDING MACHINE. APPLICATION FILED MAY 22, l9l6.

Patented Sept. 17,1918.

'6 SHEETSSHEET 6- l iq. 15.

F 41-" Z? J 5 R D NW E Ma A by ZL/M/WGDW ATTEIRNEYEJ.

:ns can Puamuma. wAsNlNGmN. a, c

STATS rnnn "COMPANY; INC., OFJBU'FFALO, NEW YORK, A. CQRPORATIOlSliOFNEW YORK.

uvrfirnrsnnnme MACHINE.

, Specification of LettersPatent.

Patented Septs I? 1918.

Application filed iMay 22, 1916. Serial No; 99,046.

To all whom z'tmay concern:

-Be itdrnown, that 1,; JOHNM..FEDDERS, a citizen of'theUnitedIStates, residing atBuffalo, inthe county oi Erieand State ofNew York, have .invented .new. and useful. Improvements. :inf. Metal-Bending Machines, of which, the". following is. a specification.

I-Thi's. invention. relates to a-machine particularly designedflfor bending, folding and seaming corrugatedstrips of metal toform units or sections of radiators used for the a a machineof this character which circulation ofair andwateriin cooling internal combustion-engines. Aymachine of this. type. is shownand described in Patent No. 1,226,490 dated-:Maylfi, 1917.

The object of this invention is to provide notonly permits 0fbending; folding and seaming or looking the end Walls of one unit: :of a. radiator. core madel from one piece .of sheet metal, but also makesprovision for theinsertion of the radiatingwebs or fins ordinarilynusedto provide a. plurality of rows of ,air conducting passages between the op posing. side walls of eachunit. These Webs or fins are seamed or locked between the vopposing side walls of each. unit during the same operations in which the end Walls thereof-areformed v .Acfurther yobject of this. invention is :to provide a machine which. .is simple yet strongand= durable in construction, efficient and positive in, operation, and which can be manipulated with -;ease Hand, quickness.

. In the accompanying drawings :Figure 1 is-ia top plan View partly brokenaway, of

a bending machine embodying my invention. Fig. 2 isa vertical: transverse, section thereof taken on line 2*2, F g. zl. Flgn 3 is .a vertical longltudinal 1 section .OIL-dlIlB 33,-.- ig. 1. Fig 4 is a fragmentary vertical longitudinalsection. on. line 41- 4, I Fig. 1. Figs. .5 {and are fragmentary vertical transverse sections taken on-the correspondinglyinumbered lines of Fig. 1. Fig. 'Z isa top pla-niview ofthe folding bladelever and associated parts. Fig :8 .is a fragmentary vertical. transverse section, similar to Fig. 2 but showinga Tditl'erent position ofthe parts. Figs 9 is aifragmentary. perspective view of one unit ofara'diator core inits completed form. Fig.;10:is afragrnentary cross section l taken on :line 10 -1,0 iFig. 9 of -a radiator core; showing lairwand water; passages. Figs; 11 1 and 112'. are (fragmentary vertlcal -diator core unit. Fig.

longitudinal sections of the .machine, on I an enlarged scale, taken 011 line :-fLFig. 1, and showing the difierent stages offolding an. integral endwall togetherwith theffin strip between the two sidewallsof a ra- ,diator l. core unit. jFigs. 1347 are fragmentary vertical longitudinal sections ct the machine, on an enlarged scaleg taken -onf-line 4-4, Fig; 1, and showing differentpositions of its parts during the successive stages thereof for forming theseamed .orllocked end wall together with the fin strip between the free'ends, of the two side walls of a ra- 18 is an enlarged fragmentary section of the finished radiator unit shown in Fig. 17

Similar characters of reference indicate corresponding parts throughout the several views.

This machine is particularly designed for folding or bending and seaming onlocking a corrugated strip ofmetal so as :to form two sidewalls 1,2which are connected at two of their corresponding ends by an integral end wall 3, while their opposite corresponding free ends are connected by a seamed or locked end wall 4 therebyforming aunit of. a radiatorcore,asshown in Fig. 9. The outer walls of each unit are provided with offset portions 5, so thatwhen the several units comprising the radiator core are assembled waterlpassages 16 are formed. between. the opposing outer walls, of said units, as showniin 10. .Arranged in the space between the opposing .inner walls of each unit, is acorrugated radiating web, strip or fin 7 which divides said space into lacplurality of. air conducting passages 8. Theintegral. endlwall 3-ofthis1strip is formed-by bending that part ofthe .nietal strip at its: turn so that the same. is folded twice upon itself into substantially the shape of the: letter. Z and comprises anouterv trans verse-folder plait 9 having a,groove.or opening between. its walls and a corresponding inner fiold oriplait 10 .WhlCll is pressed tightly together. The adjacent-end zofthe fin orwweb 7 isbent-uponitself tolform a transverse ifOld. or plait "11 C which embraces the inner fold. 10.0fthestrip, with. its .free end Minter-locked in :the opening between the walls of the; .outer fold, 9. I -Tl1e. .seamed 011 interlocked end wallA at the opposite free-ends of theside {walls 0t this strip is composed of a female member which. c0mprises an outer transverse fold or plait 13 having a grooveor opening between its walls and an inner fold or plait 14: having a groove or opening between its walls, said female member comprising one of the free ends of said strip, while the corresponding free end of the other wall of the strip comprises the male member. This male member is composed of a closed fold 15 which interlocks with the opening formed between the inner fold .or plait 14;, while the corresponding free end of the fin strip 7 is composed of a fold 16, which embraces the outer side of the inner fold of the female member, with itsfree end 17 interlocked in the opening between'the walls of the outer fold 13 of said female member. The several folds or plaits formed at both ends of each radiator core unit are pressed tightly together, as hereinafter described, so as to seal the same against leakage. The end wall 4: is preferably soldered after the pressing operation,

while it is unnecessary to solder the integral.

end wall 3.

The machine for performing the functions above mentioned comprises a main frame for supporting the working parts thereof,

7 which consists of a horizontal table 18 adapted to be supported by legs 19. Projeoting horizontally'and forwardly from the front end of this table is a shelf 20 upon which the strip to be operated on is sup- 3 ported. This strip is guided between two longitudinal guide bars 21 arranged on the upper side of the shelf.

22 represents a fixed jaw or die which is rigidly secured to the upper side of the'table and in alinement with the guideway of the shelf 20. 'Pivoted in rear of this die is a vertically movable holding jaw or die 23 provided on its upper side with a suit-able handle 24. The opposing faces of these jaws are fluted or corrugated to correspond to the contour of the strips of metal, so as to permit the same to be held firmly in place during operation thereon.

For retaining the lower wall of the metal strip against the fixed jaw 22, two sections 25, 25 of a lower mandrel are provided which are movable horizontally and transversely toward and from'each other. These lower mandrel sections are guided in suitable ways 26 which are arranged on the upper side of the table on'opposite sides of the fixedjaw, so that said sections may be moved toward each other over the latter and retracted so as to clearthe upper surface of the fixed jaw. Surmounting thelower mandrel sections 25 are two corresponding sections 27, 27 of an uppermandrel which travel over said lower sections: and are guided in the ways 26 These sections are also adaptedto move horizontally toward and from each other so as to hold'the fin strip which during the opera tion of the machine, restson the upper side moved toward and from each other into and out of their operative position by any suitable means, this being accomplished in a satisfactory manner by the means which are shown in the drawings and which. comprise two elbow levers 28 pivoted to swing vertically on the main frame below the table. The upper arm of each lever projects through a slot 29 in the table, through aslot 30 in the outer part of the corresponding lower man drel section 25 and into an opening 31 in the outer part of the corresponding upper mandrel section 27. V The elbow levers are oscillated by means of a treadle 32 pivoted on the frame below the table and connected by means of link rods 33 with the lower arms of said levers, a spring 34 connecting the treadle with the adjacent fixed part ofthe frame to retain the parts in their normal or inoperative position. Inasmuch as the upper arm of the elbow lever engages an elongated slot in the corresponding lower mandrel section it can readily be seen that al though the latter may be moved inward by the action of the elbow.lever,as shown in Fig. 8, it cannot bemoved outward to the position shown by dotted lines in said figure. The preferred means for causing said section to move outwardly with the elbow lever upon releasing the treadle, is constructed as follows: V

Arranged adjacent to the inner edge of the slot 30 of each lower mandrel section isa vertical opening 35 which is adapted to receive a coupling or locking pin 36 passing through an opening 37 in the corresponding upper mandrel section when the said sections are in their operative position,shown in Fig. 8. This pin is movedto engagewith the opening 35 by means of projections'38 secured to opposite sides of the hinge die and adapted to engagethe heads of the pins 36 when the hinge die is swung to thehorizontal position shown in said figure." Upon the outward mutual movement of the mandrel sections, each of the pins 36 engages an inclined plate or-uncoupling wedge 39 extending acrossthe top of the guideway 26 andprovided with a slot 40 which receives the shank of saidpin. As the pin engages this slot the underside of the head of said pin engages theinclined upper surface of the wedge-and withdraws the pin from ongagement with the corresponding lower man drel section, so that when the treadle is again" depressed, the levers 28 willcause the two sets of die sections to move inwardlyand stripresting thereon so tionsare concerned, the operator first places the corrugated strip of metal on the fixed jaw with a part-,apreferably halfthereof,

I projecting beyond the inner or rear end of said fixedjaw. The lower mandrel sections Wl1lCl1al3 tl11S timeare in their outermost position, are now moved inwardly over-the fixed or lower jaw or dieand that part of the underside of these sections fit the uppen side of the strifi and thereby retain the same in position. he upper mandrel sections having been moved inwardly in-unison with the lower sections are-now allowed to move outward again byiethe releasing of the treadle by the operator,leaving the lowersections still-in their" inner position. The corrugated .web or fin strip; is then placed on the upper side of the two lower mandrels with a small fraction thereof projecting. over the rear edge ofjsaid mandrels. N ow theuppermandrels are moved inwardly over the lower mandrels andthat part of the strip resting thereon so as to retainthe-same in position.

which forms the'other side wall ofthe radiator core unit, is folded orbent forwardly by means of the hinge jaw being swung forwardly and downwardly, .thereby placing the strip with its corrugations engaging the 1 corresponding corrugations on. the upper ing; beyond the rear edge of the folding drel sections.

side ofthe uppen mandrel sections and re- ,taining thesame between the latter and said -35.

,sheet of metal; at the foldofvthis strip projectsbeyond-the rear-edges of the mandrel hinge .jaw. At this time a portion of the sections,as shown in Fig, 11. While in this position this projectingportion is. folded, plaitedor doubled upon itself bymeans which are preferably constructed as follows:

41 represents a transverse folding blade which isadaptedto V be moved vertically :im-

-rnediately in rear of the hinge jaw and mandrel sections and toward and from the lower fiXed jaw-for the purpose of causing the lower edge of: this blade to engagethatpor blade when in its lowered position. The upper portion of this'die isrounded, as shown,

so as to act upon the metalgradually or uniformly without injuring or cuttinglthe that the corrugated parts remain in thisposition, the V othersection or halfofthe corrugated strip,

to the top of the supporting secured to .the table of theframe. leveris held constantly. in-the recess 58. by ,means of a. spring 61 .arrangedtbetweenj the underside of its outerarm and the. top f metal. strip. This diemaybe guided inany Well known manner, and the vertical ,movement of thesame, which. takes place-during the bending I operation, is. effected by means of lifting wedges 45 arranged. to travel back and forth over the table and underneath the loweredge of the bending die. In its lowermost or inoperative, position, tliebending die rests upon thertable and at that time a the lifting wedges are arranged in rearand out of engagement with said die. .moving' these wedges forwardly the Upon same engage the. notches-46 in the underside of thebending die and raise the same to the bending or operative position. To permit the forward} movement of the. wedges in raising the bending die, the lower fixed jaw isprovided in its underside with recesses 47.

At their rear ends these wedges are secured to the lower front part of; a horizontally.

and longitudinally. movable presser baror slide 48 which is guided onthe table between guides 49. The forward movement of this slide together with the lifting wedges .4 5 is produced by springs 50,interposed between the rear end of the slide and a bracket 51 secured to the table. The rearward move- 1 ment ofithis slide and the parts connected therewith is produced by means of a horizontally swinging elbow lever 52 pivoted table adjacent tot-the folding bladef lever and having an inner arm which is connected with the upgPBIPSldB of theslide by a pin 53 secured V to said slide and passing through aslot .54:

1n the adjacent arm-of the. elbow lever,:while the outer arm isadapted to beengaged by a tail 55 secured tothelower portion of the folding blade lever belowvthei fulcrum there- .of. During the; upward movement of the.

bladelever its tail 55 engages the; outer arm ofthejelbow lever 52 and turns thesame .in a.;.direction whichwill ,cause the inner r arm thereofto move ,-theslide rearwardly to the position shown in p gagementof this tail with the adjacent arm Fig. 1. The enof the elbow lever also servesas a stop to limit thetlateral movement of theblade lever and hold the sameln a substantially upright position. After the slidereaches itsoutermost-position it is, automatically locked against forward movementby means of a latch or locking lever 56 pivoted-.on the adjacent part of the table so as to swing vertically andhavingan inner arm which is ,provided with a locking nose 57 adapted to engage a recess oriopening 58 in the upper adjacent partofthe slideancl an outerarm which.

projects horizontally; into the path of a tappet arm 59 pivoted to a bracket GO or other adjacent ,part The nose 57 of this locking spring and by means of a bolt 68 while its outer'end thetable, as shown in Fig. 3. In order to release this nose from engagement with the presser bar or slide 48, the folding blade handle is provided witha releasing lever 62 preferably constructed in the form of a secured thereto at its lower end is free and is provided with a releasing pin 64 which is adapted to pass through an opening inthe adjacent part of the blade lever or handle and engage the underside of the inner'arm of the tappet 59. In its normal position, the releasing pin 64 is held out of the path of the tappet arm by the releasing-lever 62 which is normally held in the position shown in Fig. 7 Q When it is desired to cause the slide to move outward or toward the jaws and mandrels, the fold ing lever is swung to the horizontal position in the act of folding a strip of metal, at which time the pin 64: is below the path of the inner arm of the tappet bar, and then the spring lever 62 is pressed inwardly against the face of the folding lever thereby moving'the releasing pin inwardly into the path of the tappet arm. Upon now moving the blade lever upwardly, the tappet arm will be turned vertically by the action of the releasing pin engaging the underside of the inner arm of'said tappet, while the outer arm thereof will be moved downwardly striking the corresponding outer arm of the locking lever 56, thereby releasing the inner arm thereof from the slide and permitting the latter tomove forwardly under the act on of its propelling springs. The outer arm of this locking lever'is provided with a suitable handle for manually operating the same. 7

' In order to limit the rearward movement of the hinge jaw'and to support the same when it is not in use and in its inoperative position, a stop is'provided which is formed by notching the upper parts of the guide bars 49 so as to form a stop face 66 against which the rear part of said hinge die is adapted to rest. I

In forming the two end walls of a radiator core unit by the operation of-this machine the integral end wall 3is first made and after that is completed the interlocked end wall 4 is made.

Passing now to the operation of this machine by making the integral end wall first, a. previously corrugated and off-set strip of metal, having a length somewhat greater than the combined length of two finished side walls of a radiator core unit so as to allow for the making of the end walls thereof, is first placed lengthwise upon the guide shelf and over the opposing faces of the fixed and hinge jaws so that part of this strip adjacent to the center thereof is arranged between the rear ends of said jaws and spans 7 the space between the same. At this time 'the parts of the machine are in the position 'shownin Figs. 1, 2, 3 and 6 eXc'eptthat instead-of the lower mandrel sections being in the positlon'sho'wn in Figs. 1 and 2, they are withdrawn to the position which the upper mandrels assume in said figures so as to make a clear path for placing the corrugated strip upon the fixed The opera tor now presses the treadle so as tomove the two upper and lower mandrel sections inwardly over the strip resting on the fixed V vertically in line with the lower strip with a portion thereof projecting beyondtherear edge of the fixed jaw and mandrel sections to allow for, the fold-or plait, as shown clearly in Fig. 11. The upper mandrel sections are nowdrawn together by pressing down the treadle to hold the fin strip firmly in place. The extended portion of the lower strip of metal is then brought forwardly over thecorrugations of the upper mandrel sections by swinging the hinge jaw forwardly and downwardly, thereby'bringing with it said portion of the strip and'holding it firmlyin place between the opposing faces of said jaw and mandrel sections, as shown in Fig. 11. Upon the downward movement of the hinge jaw, the projections thereon en gage the retaining pins 36 in the upperman= drel sections and force them through the corresponding openings inthe lower sections,

so that when the operator subsequently releases the treadle as hereinafter described,

both mandrel sections will be moved outwardly in unison. The two walls of the core unit together with the fin strip are then bent downwardly by the folding blade along the rear edges of v the mandrel sections. The

operator then allows the tappet to release the lpcking lever from engagement with the spring'pressed slide or presser bar, whereby the latter instantaneously moves forward, raises the bending die so as to turn the rearmost portion of the integral fold of the strip upwardly along the rear side of the folding blade, and immediately thereafter the front portion ofthe presser bar strikes a hard blow against the rear side of the bending die so as to flatten and compress the folded or plaited portions of the integral end wall and fin strip, as shown in Fig. 12. 1f de- 7 sired the integral wall may be compressed V are reversed end forend tightly together by removing the folding blade from'the innerlloop formed in said wall and allowing-the resser bar to. strike anotherblow against t e bending die, the result of which is shown to the right of Figs. 13.17 and also-in Fig. 9.

After; thus forming the integral end wall and interlockingtheadjacent end oft-he fin strip therewith, the several strips forming the core unitare removed from the machine byfirst raising the hinged upper jaw, and then-withdrawing both sets of mandrel sections. r I w In formingtheopposite end wall of the radiator core unit,theside wallsand fin strip and placed on the guide shelf with that side wall of the strip having ethe greater length resting :onthe lower fixedjaw sothat-a portion of its free end projects rearwardly over the bendingdie and the-adjacent part, of the face of the hinge jaw. The: operator then depresses the treadle which causes, both sets. of mandrel sectionse-tomove inwardly, the lower isece tionspassing o'verthe sidewwall of the strip resting jonthe fixed aw,-to hold the; same. in place: The; upper:- mandrel sections are moved-outwardand the :fin strip placed'on the upper side of the. lower mandrels with a portion thereof projecting rearwardly over the -rear edge ofj said lower ,mandrels, after which the-upper, mandrel sections are again moved inward and the hinge jaw is swung downwardly upon the upper mandrel sec tions, whereby the rearwardly: projecting end portion. of the lower side wallis bent forwardly andclampedbetween, the upper side of the up: per-mandrel sections, and hinge jaw and the turned portion:- thereof "left; in a position in which the same projects overjthe upper end or thebending d1 e,as shown in Fig. 13.5 The folding ,bladeis now apress'ed downwardly so. as toform a, plait or. downward doubled bend in the projectin ,portions of the lower wall and .fin-v strip w ich in effect produces an upwardly opening transverse groove, as shown in Fig. 14,-. The folding blade is now raised, afterewhich the hinge die is swung rearwardlyiand thefree endof the other sidewall-of the radiator core unit is placed upon theupper'side of theupper mandrel sections with a portion thereof projectin rearwardlyover the rear edge of the mandrel sections and. overlapping; thedoubled end portionof the, lower wall and fin strip. The hinge die is thenwswung downwardly over the upper wall of the strip, as shown ;in Fig-15., While theparts are in this position, the fold-in blade .is pressed downwardly to form a fol orplait in the upper wall .ofthe strip similar to. that, formed in; the lower wall, and fin strip ,prgducedin the stepheretofore described, Thefold in the upper, wall of,-,.the strip ,seats itself in the transverse.

qpes sf m dr yjthe l de cribed. opera-e a... After: the blade isfully depressed, the

locking leveris tripped and the presser bar allowed to'move forward so as to compress the folds, as shown in Fig. 16. Thefolding blade-is now raised and the presser bar moved rearwardly by the action ofithe elbow lever being swung outwardly by means of thetail of said folding blade engaging the adjacent arm ofthe elbow-lever. I The presser bar is againwcaused to strike a blow against the'folded or plaited end portion of the core unit and compress all folds tightly together, as shown in Fig. 17. The completed-score unit may now be removed by raising the. hinge die and withdrawing both sets of-mandrehsections by releasing the foot treadle.

'By thus forming the end walls of a core unit, the enduwallsarexnot only sealed, but the fin strip .is firmly interlocked therewith and prevented from displacement therefrom. A plurality of such units are then assembled so as to form water tubes between the opposing .walls of'the adjacent units, as shown in FigrlOr. The. several units are then dipped at the frontandrear ends into a solder bath forunitingtl1esa1ne,anda coating ofsolder isalso applied to the interlocked end walls oftheunits so as to exclude waterfrom the corresponding air passages, thereby completing the core ofthe radiator. Thereafter, this core is l. assembledin the ordinary way with the upper and lower headers or water boxes and inclosed in a frame.

My improved machine for bending,.folding and seaming a strip of'metal to form thefend wallsof a radiator core unit, together withruniting the finstrip therewith for dividingthe unit into a plurality of rows of air conducting passages, permits ofnaccomplishing this work easily, effectively and in a comparatively short time.

I claim asmy invention:

1. A'metal bending machine comprising a lower jaw, an upperjaw, said jaws being movable relatively to each other, and mandrels arranged one above the other and each comprising two sections which are movable laterally into and out of the space between said jaws.

2. A metal bending machine comprising a lower fixedj aw, a vertically swingingupper jaw movable toward and from the fixed jaw and adapted to bend a strip of metal between them-upper and lower man'drels. adapted to move simultaneously into the space between said jaws for. supporting strips of metal, andmeans-for withdrawing said upper mandrelindependent of said lower mandrel comprisingan elbow lever connected with said upper mandrel, and foot operated means for turning said lever for removing said mandrel from the space between said jaws.

3. A'metal .bendingmachine comprising alower fixed jaw, a vertically swinging upper jaw movable toward and from the fixed mandrels adapted to move simultaneously into the space between said jaws, and means for causing said mandrels to move in un 1son out of the space between said jaws, said jaws and mandrels being adapted to finally cooperate at the same time.

4;. A metal bending machine comprising a lower fixed jaw, a vertically swinging lipper jaw movable toward and from the fixed jaw and adapted to bend a strip of metal between them, upper and lower mandrels adapted to move simultaneously into the space between said jaws, means arranged on said upper mandrel and adapted to cooperaterwith said lower mandrel while in their innermost position for temporarily connecting said mandrels so that they will move together from the space between said jaws, and means to cause said mandrels to move from said space.

-5. A metal bending machine comprisinga lower fixed jaw, a vertically swinging upper jaw movable toward and from the fixed j awv and adapted to bend a strip of metal between them, upper and lower mandrels adapted to support strips of metal and each comprising two sections movable laterally into and out site sides thereof, means for operating the upper mandrel sections independent of the lower mandrel sections while the latter are in their innermost position, and means for 'removably connecting said upper and lower mandrels while in their operative position to cause the withdrawal of the lower mandrel sections in unison with the upper mandrel sections.

6. A metal bending machine comprising a lower fixed jaw, a vertically swinglng upper aw movable toward and from the fixed jaw, upper and lower mandrels movable into and out of the space between said jaws,

means for moving said mandrels simultaneously'into the space between said jaws but movable independently therefrom comprising an elbow lever engaging with an opening in said upper mandrel and projecting through a slot in said'lower mandrel.

A metal bending machine comprising alower fixed jaw, a vertically swinging upper-j aw movable toward and from the fixed jaw, upper and lower mandrels movable into and out of the space between said jaws and each comprising two sections, means for moving said mandrels simultaneously into therspace between said jaws but movable independently therefrom comprising elbow levers engaging openings in said upper mandrel sections and projecting through slots in said lower mandrel sections, and means for connecting the upper and lower man drel sections while in their inward position to cause the withdrawal of the lower mans drel sections in unison-with the upper mandrel sections and for disconnecting the same i in their outward position :to permit independentinward movement of the same.

8. A metal bending machine comprlsmg a 7 lower fixed jaw, a vertically swinging upper jaw movable toward and from the fixed jaw and adapted to bend a strip of metal between them, upper and lower mandrels adapted to support strips of metal andeach comprising two sections movable laterally into and out of the space between said jaws from opposite sides thereof, means foroperating said upper mandrel sections independ ent of the lower mandrel sections while the latter are in their innermost position and means for connecting said upper and lower mandrels while in their operative position to cause the withdrawal of the lower mandrel sections in unison with the upper man-' drelsections comprising a locking pin slid ably arranged in each of the upper mandrel sections and adapted to engage with an opening in the companion lower mandrel section, and means arranged on said upper jaw for shifting said locking pins into engagement with said openings when said movable jaw isswung to its operative POSI- tion.

9. Ainetal bending machine comprising a lower fixed jaw, a vertically-swinging upper jaw movable toward and from the fixed jaw and adapted to bend a strip of metal between them, upper and lower mandrels adapted to support strips of metal and each comprisingtwo sections movable laterally into and out of thespace between said jaws from opposite sides thereof, guides for said mandrels, the upper mandrel sections being operable independently of the lower mandrel sections while the latter are in their innermost position, means for causing the withdrawal of the lower mandrel sections in uni son with the upper mandrel sections comprising a locking pin slidably arranged in each of the upper mandrel sections'and adapted to engage with an opening inthe companion lower mandrel section, projections on said upper jaw for moving 'said locking pins into engagement with said openings when said upper jaw is swung into a horizontal position, and wedges forreleasing said pins from the openings in said lower mandrel sections when the latter are withdrawn from the space between said jaws. r a

10. A metal bending machine comprising a lower fixed jaw, a vertically swinging upper jaw movable toward and from the fixed jaw and adapted to bend a corrugated strip of metal between them, upper and lower mandrels movable into and out of the space between said jaws and adapted to support strips of metal between their opposing bending die in rear of faces, a folding blade movable vertically in rear of said mandrels and jaws and adapted to form a plait in said strips of metal, a said fixed jaw, a presser bar, a latch for holding said bar in it rearward position, a vertically swinging lever on which said folding blade is mounted, and means on said lever for releasing said latch from said bar.

11. A metal bending machine comprising a lower fixed jaw, a vertically swinging upper jaw movable toward and from the fixed jaw and adapted to bend a corrugated strip of metal between them, upper and lower mandrels movable into and out of the space Copies of this patent may be obtained for five cents each, by addressing the between said jaws and adapted to support corrugated strips of metal between their-opposing faces, a folding blade movable vertically in rear of said mandrels and jaws and adapted to form a plait in said strips of metal, a-bending die in rear of said fixed jaw, a'presser bar, a latch for holding said bar in its rearward. position, a vertically swinging folding lever on which said folding blade i mounted, a tappet arm, and a releasing lever arranged on said folding lever and provided with a pin adapted to removably engage said tappet for releasing said latch from said presser bar.

JOHN FEDDERS.

Commissioner 0! Patents.

wu.shington, D. 0. 

